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Sweep 25 Sep 2026 · 19:33Z Build v2.1.283 504 read Stable v2.1.274 Latest v2.1.283 Next v2.1.283 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.281 ·

WebFetch dedup shadow telemetry

WebFetch now measures how often the same web page is fetched again, without changing what it returns

Entry
JSON All of v2.1.281
EntryKind: in v2.1.281,
ChangesSection of the release
What

WebFetch, the tool Claude uses to read web pages, now keeps track of each address it fetches and short fingerprints of the requests made with it, up to 32 per address. It reports this as usage data (tengu_web_fetch_dedup_shadow), including:

  • whether the page was already cached
  • whether it was a repeat fetch, and how long since the previous one
  • whether the request and the agent asking were the same
  • how the result was produced: agent_raw, raw_markdown or secondary_model
Why

This is measurement only. Fetch results are the same as before.

Read from
Feature flag
tengu_rosy_flute Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.281: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.281. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_rosy_flute

See this entry in the whole of v2.1.281 →

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